Spacer for Ikea Fönsterblad

Spacer for the holders of the Ikea Fönsterbladroller blinds. 

I was in the situation where the ceiling was not level and needed a 1cm spacer on one side. Wuickly drew this, and worked perfect. 

These add 1cm,  but you can easily change the size to make them bigger or smaller. 

My guess is that this will fit with other Ikea roller blind holders as well, but I don't have those.